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I'm trying to harden my RHEL Linux server 7 according to the CIS guidelines, so I want to unload the cramfs.

I typed the following command: modprobe -n -v cramfs

and I got the following answer:

insmod /lib/modules/3.10.0-693.el7.x86_64/kernel/fs/cramfs/cramfs.ko.xz

instead of the one mentioned in the CIS: install /bin/true . I note that there is no such file in my system.

Question: what does the output mean ? In this context, how can I unmount the cramfs?

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The command you are running, modprobe -n -v cramfs does nothing except output what it would do as you passed -n which is the short option for --dry-run. The output insmod /lib/modules/3.10.0-693.el7.x86_64/kernel/fs/cramfs/cramfs.ko.xz would load the cramfs module at that location.

You probably wanted to do modprobe -v -r cramfs as the -r flag is the short option for --remove.

This does not prevent the module from being loaded again on reboot, or being loaded again manually. To prevent that, you would need to blacklist the module which is a bit more involved.

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